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I'm not sure why this was limited to a small set of 4xx responses. Nominally, no 4xx request should be retried (in fact the comment below says this, but then the code didn't quite match it).
This was causing key backup requests to be retried even when the server responded 404 because the backup in question had been deleted, meaning the client would retry uselessly and it would take longer for the client to prompt the user for action.
Checklist
public
/exported
symbols have accurate TSDoc documentation.